Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       artefacta - artefacts
         Product group materials
           Product group fibers
             Product group manufactured fibers (FTC)
               Product group natural polymer fibers
                 Product group cellulosic fibers
                   Product rayon fiber (FTC)
                     1 Product viscose rayon
                     2 Product cuprammonium rayon